Hey there! Sign in to join this conversationNew here? Join for free
Turn on thread page Beta
    • Thread Starter
    Offline

    11
    ReputationRep:
    I am struggling to understand this example. I can't find the values listed in the first table for the probability of x, from the binomial distribution tables. Are these values wrong? I can only find 0.1074, im looking at the table for B(10,0.2)

    Any ideas?
    Attached Images
     
    Offline

    19
    ReputationRep:
    (Original post by Katiee224)
    I am struggling to understand this example. I can't find the values listed in the first table for the probability of x, from the binomial distribution tables. Are these values wrong? I can only find 0.1074, im looking at the table for B(10,0.2)

    Any ideas?
    please post to the maths help forum
    http://www.thestudentroom.co.uk/forumdisplay.php?f=38
    Offline

    20
    ReputationRep:
    (Original post by Katiee224)
    I am struggling to understand this example. I can't find the values listed in the first table for the probability of x, from the binomial distribution tables. Are these values wrong? I can only find 0.1074, im looking at the table for B(10,0.2)

    Any ideas?
    it may be that you are looking at cumulative binomial tables... to look up "exactly 5" for instance you would do "cumulative to 5" - "cumulative to 4"
    • Very Important Poster
    Online

    21
    ReputationRep:
    Very Important Poster
    (Original post by Katiee224)
    I am struggling to understand this example. I can't find the values listed in the first table for the probability of x, from the binomial distribution tables. Are these values wrong? I can only find 0.1074, im looking at the table for B(10,0.2)

    Any ideas?
    I'm guess they're talking about the cumulative binomial tables ( you could find out each P(X=x) by doing P(X =x) = P(X less than or equal to x) - P(x less than or equal to x -1) but if you can't see that also try calculating P(x=1), i.e 10C1 * 0.9^9 * 0.2.

    Edit: Should be 0.8^9. Sorry!
    • Thread Starter
    Offline

    11
    ReputationRep:
    (Original post by the bear)
    it may be that you are looking at cumulative binomial tables... to look up "exactly 5" for instance you would do "cumulative to 5" - "cumulative to 4"
    (Original post by SeanFM)
    I'm guess they're talking about the cumulative binomial tables ( you could find out each P(X=x) by doing P(X =x) = P(X less than or equal to x) - P(x less than or equal to x -1) but if you can't see that also try calculating P(x=1), i.e 10C1 * 0.9^9 * 0.2.
    I feel really stupid now haha so obvious

    thanks guyyssss
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: October 21, 2015
Poll
“Yanny” or “Laurel”

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.